Sewing-machine.



A.|1. SCHUENKY.'

SEWING MACHINE.

. APPLICATION FILED MAY 31. 1913.

1,171,466.. Patented Feb.15,1916.

2 SHEETS-SHEET ll.

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Row/)I A. R. SCHOENKY.

SEWING MACHINE.

APILLCATION` FILED MAY 3l. I9I3. 1,171,466. Patented Feb.15,1916.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

AUGUST B. SCHOENKY, OF SOMEBVILLE, MASSACHUSETTS, ASSIGNOR TO SHOE'MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION 0F MAINE.

THE manenk SEWING-MACHINE.

Speeication of Letters Patent. I

Original application led September 25, 1912, Serial No. 722,300. Dividedand `this application illed May 31, 1913. Serial No. 771,000i.

To all whom it may concern welt system, whereby the outsole and welt aresewed together. Other examples of that type of machine which may bereferred to for the purpose of supplying details that are omittedherefrom, are illustrated in my prior Patent No. 1,071,355, dated August26, 1913, and application No. 722,300, filed September 25, 1912, ofwhich last mentioned application this present application is a division.

An object of the present invention is to generally improvethe.construction andoperation of sewing machines of all classes,I

such for example, as the sole sewing machines of the type referred to.

Another object hereof is to improve the presser foot mechanism so as topermit the lifting of the presser foot at will, by means of a lever ortreadle in a more eiiicient and convenient manner, less injurious to themechanism than heretofore.

Other objects and advantages pertaining to the present .invention willappear in the hereinafter following description, or will be apparent tothose skilled inthe art.

To the attainment of such objects and advantages, the present inventionconsists in the novel combinations, arrangements, devices and parts setforth, described and illustrated in the following description andaccompanying drawings.

I will first describe one form of machine embodying my improvements andwill thereafter point out the novel features in the claims. f

In the accompanying drawings forming a part hereof, Figure 1 is aright-hand elevation of certain details, including the presserfootlifting mechanism,- taken in section on the plane 4.-4 of Fig. 1, ofapplication 722,300, the parts being shown in initial position. Fig. 2is a vien7 similar to Fig. 1, but

in a position with the presser-foot treadle or lever partly depressed.Fig. 3 is a similar view, withthe parts in a position with the treadlefully depressed. Fig. 4 is a similar View showing the parts in positionfor the automatic release of the work beneath the presser-foot, whichoccurs during the formatlon of each stitch. Figs. 5, 6, 7 and 8`represent details of certain parts shown in Figs.

Similar reference numerals'designate corresponding parts in the severalfigures of the drawings.

I will refer now'by reference numerals to the machine parts illustratedin the accompanymg drawings.

Extending upwardly from any 4convenient base is the post 1, supportingat its upper end the head, or casting, 2, which will be of a complicatedstructure unnecessary to describe, it affording `support for various ofthe workingor non-working machine parts hereinafter to be referred to.The. main shaft 3 runs in the upper part of the machine, 4extending fromleft to right, and supported in bearings or brackets. At the left end ofthe shaft 3, is a pulley, which may be engaged by a belt for driving themachine. The main shaft may carry a number of cam disks including camdisk 7 shown lin the figures. This cam disk at its right-hand sidecontains a cam 36 for automatically operating the presser-foot duringeach stitch, imposing upon it an additional pressure, and periodicallyreleasing it during feeding.

The manner of feeding, the manipulation of the thread, the vvariousoperating connections and lother parts of the machine may besubstantially as in said priorl applications.

I will now describe the operative connec-l tions whereby the cam orgroove 36 in the cam disk 7 effects the automatic operation of thepresser-foot 23. Particular reference is made to Figs. 1 and 4. Thepresser-foot 23 is carried at the forward end of presserfoot arm 66,capable of swinging about a fixed stud 67 and having ay rear extensionor 7 4: projecting therefroi'n,I to which secured foot may be effectedthrough a toothed rack 76, on the spring extension or arm 69, a dog 77enga-ging said rack, a toothed rack 78 onl the arm 68, and a tripled0g79 engaging` the rack 78. There is shown a spring 80, pressing dog 77to rack 7 6, and a triple spring 8l, pressing the components of thetriple dog 79 into contact with rack 78. t

The presser-foot operating lever 82, pivoted at the rear, as shown,possesses a stud 83, which engages the cam groove 36. The forward end ofthe operating arm 82 has the dog 77, already referred to, pivoted uponit, and carries the spring 80 therefor. The arm 82 also has a projectionor heel, 84, shaped and located at proper times to kick and therebydisengage the triple dog 79. This operation occurs when the operatingarm 82 descends, and at such time the dog 77 is also disengaged from itsrack through a fixed pin 85, located to contact and throw open the dog77.

The operation of the mechanism thus described may` be as follows:`During the formation of each stitch the work must be released for asuiicient time to permit its feeding, and when the` feeding is completedthe work is to be again clamped and firmlyv held under heavy pressureduring the vari- 75. When the stud, 83, passes out of the shortconcentric portion, it is lifted, with the result that the dog, 77engages the rack, 76, to elevate the spring arm, 69, and thereby imposesthe force of the powerful spring 70, upon the presser-foot, while at thesame time, the triple dog, 79, having a fixed pivot is thrown intoengagement withl the rack 78, thereby positively locking the presserfootin its depressed position.

In order to enable the presser-foot to be lifted at any `desired stageof operation, .I

have provided the following improved mechanism: The vertical rod, 86,will be adapted at its lower end to be depressed by a lever or treadleat the will-of the operator.

Livres@ and 6, adapted when the treadleis lowered to Contact the arm 72and depress it, thus raising the'` presser-foot. Manifestly, thepresser-foot cannot be raised while under heavy pressure without firstdisengaging the dogs. Loose on the short shaft 73, is a toothed plate,89. This coperates with the treadle rod by its pivot connectiontherewith as shown, so that the plate, 89, guides or directs the treadlerod in its up-and-down movements, while the treadle rod eectsoscillations of the plate 89. Coperative with the toothed' plate, 89, isa secondA toothed plate, 90, the latter being loose upon the stud shaftof the triple dog. Each of thelplates 89, 90, is shown as having twoteeth, capable of mutually engaging. The triple dog, 79, is providedwith a pin 91, for opening it, this pin lbeing ,for convenience securedto the middle member and adapted to contact the other two members of thedog, as shown in Figs. 7 and 8, the pin, 91, also projecting leftwisebeyond the dog, as seen in Fig. 8, so as to stand in the path of thetoothed plate 90. The plate 90 has an upwardly extending portion whichis centrally notched to accommodate the fixed pin 85. The portion of theplate below the notch is adapted to strike the pin.

91 (see Figs.. 10 and 11) for disengaging the triple dog 79. The upperportion 92 of the extension plate 90 is adapted to strike aL pin 93 foreffecting the opening of the dog The operation of the mechanism thusdescribed xnay Ibe as follows: llt will be noticed that the projection88 onthe treadle rod head .isfnor'mally spaced considerably above thearm72, so as not to come in contact with the latter for actuating it toraise the presser-foot until the dogs have' been released.` Asis clearin Fig. 5, the depression of the treadle rod first eHects a swingving ofthe toothedplate 89, which, being engaged with the toothed plate 90,swings the latter in a right-hand direction, or toward the rear of themachine. By this action, the pla-te 90 immediately strikes the `pin 91,and also the pin 93, thereby disengaging both of the dogs 77 and 79. Thecontinued depression of the treadle rod brings projection 88 intocontact with arm 72, thereby pulling down the link 71 and raising thepresser-foot. As 'will be seen in Fig. 5, the toothed plates 89 and 90are so shaped that the teeth will disengage after a Ibrief movement,whereby further depression of the treadle will not further actuate theplate 90. The plate 90 therefore serves to disengage the dogs and thencomes to rest. This is of very great advantage, for the reason that ifthe movement of disengagement should lbe continued throughout the entiredepression of the treadle rod, an excessive and unnecessary displacementand strain upon the dogs and their springs would be caused; `With themechanism shown, the dogs are only actuated sufficiently to disengagethem, and the concentricarc.-

shaped portion of the plate 89 thereupon during the further depressionof thetreadle,

locks the plate 90 in dog-disengaging posi tion. The subsequent raisingof the treadle rod causes first a mere swinging of plate 89, followed'by an engagement of its teeth with the teeth of plate 90, therebyrestoring both plates to the normal position shown in Figs. 4 and 5.

It will thus be seen that there has been described a presser-footmechanism embodying the principles and attaining the objects andVsupport, a dog and rack mechanism for intermittently locking the footunderv heavy pressure upon the work, a dog disengager adapted to bepositively moved into a position for disengaging the dog from the rackand to be locked in such position, and a shiftable part or treadlehaving connections whereby the movement of the treadle' acts first tomove the disengager -to aposition'j to disengage the dog, and then tolock vsuch Y disengager in such position, and then tof] lift the footwhile the disengager remains stationary. ,l

2. In a sewing machine the combination of a Work support, -a movablepresser-foot adapted to bear upon the work upon the support, a dog andrack mechanism for intermittently locking the footunder heavy pressureupon the work, a dogdisengager adapted to be positively moved into aposi-v tion for disengaging the dog from the rack and to be locked insuch, position, and a `shiftable part or treadle having 'connectionswhereby the operative movement of the treadle acts first to move thedisengager to a position to disengage.' the dog, and then to lock suchdisengager in such position, and then to.1ift the foot while thedisengager remains stationary, while the returnl move- .ment of thetreadle restores the presser-foot before restoring the disengager torengage the dog and rack. I 'l L 3. Inn a sewing machine the combinationof a work support, a movable presser-foot adapted to `bear upon the workupon the support, a dog and rack mechanism for intermittently lockingthe foot under heavy pressure upon the work, a dog disengager such aslthe plate 90 fitted for swinging movement only and adapted to bepositively Vswung toward the dog into a position for disengaging the dogfrom the rack and to be locked in such osition, and a shiftable part ortreadle having connections whereby the movement of the treadle operatesfirst to swing the disengager to a 'position to disengage the dog, andthen to, lock such disengager in such position, and-"thenlgto lift the,foot while the disengager 'remains Stm l tionary;

4.5 In a sewlng machine thejcombination of a movable work-engagingmember, a lockl ing device therefor, a movable disengager adapted toswing for unlocking said device, and a shiftable part or treadlehavingcon.- nections acting in its operative movement for first moving saiddisengager toa positionl to unlock said device, then locking saiddisengager stationarily in such position, and thereafter during thefurther movement of said part or treadle retractig said workengaginghmember from the work while the disengager is locked, inposition to hold said device: unlocked; the reverse movement of said'part or treadle acting to first restore the work engaging member beforerestoring-the disengager to permit the relooking of saidv device. 4 5.In a sewing machine the combination A,of a presser-foot adapted to belifted and lowered and during stitching to be locked under pressure andunlocked, a swinging presser-foot lever, a locking device coperatingwith said lever for intermittently lock-v ing the presser-foot, adisengager ada ted to be movedto a position to unlock-sai device a nd tobe itself .locked in such position, a controlling part or shiftabletreadle -normally unconnected with said lever so as not,

to partake of i s stitching movements, connections actuab e from saidtreadle during n i the first part of vthe treadles shifting for lmovingsaid disengager to unloclr said device and f or'lockingsaid disengagerin such position, and other connections actuablc Iby the continuedtreadle shifting movement for lifting said presser-foot after theunlocking of said device.

' In testimony whereof I afiiX my signature' in presence ofl twowitnesses.

. v AUGUST R. SCHOENKY.

Witnesses:

J.WARREN NICHOLS,

. Tnoms J. Cairn',A

